Hifonix BRZ1200.1D issue - diyAudio
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Old 17th April 2013, 02:18 PM   #1
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Default Hifonix BRZ1200.1D issue

This one has a weird issue that I cant pin down.

It works, but it has really low volume. I have to turn the gain all the way up before it begins to beat the subs. Then when I do this, it starts clipping only at certain frequencies, and when this occures it starts cooking the sub, B+ rails drop during clipping.

Idle no clipping I have +/-65V rails. they sag to about 30v when clipping. And its burning the sub when it clips.

Last edited by mbates14; 17th April 2013 at 02:21 PM.
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Old 17th April 2013, 02:54 PM   #2
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Quick measurements gave me this:

100Hz Sinewave tone into RCAs. 0.4VAC input on RCAs.

R201 couples the pre-amp/crossover stage to the Class D driver board. the Driver board side with gain turned all the way up is 0.8VAC.

Pre-amp side of resistor is about 6.5VAC. Resistor measures fine.

is this normal? or is the class D driver bad. Both 8 pin SOIC-W ICs are scratched off. Both get really hot.

any ideas?
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Old 17th April 2013, 10:40 PM   #3
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I see......

Anyway, I figured out the 2 ICs on the driver PCB are TL072. I have an O2 audio which is a hifonix PCB and it wasnt scratched off.

Replaced them and the issue seemed to have gone away. We will see.
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Old 21st April 2013, 12:20 AM   #4
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When you repair these amps, replace the two 1D transistors in the center of the board, even if they're not defective. They run hot and commonly fail.
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Old 21st April 2013, 12:27 AM   #5
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Center of which board? also what package, SOT-23?
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Old 21st April 2013, 12:59 AM   #6
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See attached.
Attached Images
File Type: jpg bxi2006daudiodriverboard01b2.jpg (210.9 KB, 40 views)
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Old 21st April 2013, 10:57 PM   #7
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Yea, I changed the 2 072s on that board. The top right one looked brown where it had gotten hot, and was getting hot. Changing those 2 op-amps improved the sound.

I didnt change those transistors yet. What is the symptom of these failed transistors?
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Old 22nd April 2013, 06:30 AM   #8
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Amp stays in protect.
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